Mold for hollow articles.



E. KERR & J. SMITH.

MOLD FOR HOLLOW ARTICLES. APPLICATION FILED APR.5,1909.

Patented Sept. 27, 1910.

5 SHBETS-SHEET 1.

a {INVVENTORS WITNESSES:

E. KERR 61: J. SMITH.

MOLD FOR HOLLOW ARTICLES. APPLICATION FILED APR.5, 1909.

Patented Sept. 27, 1910.

6 SHEETSSHEET 2.

INVENTORS E.'KERR & J. SMITH.

MOLD FOR HOLLOW ARTICLES. \PPLIOATION I'ILIJD APR.5, 1909.

Patented Sept i910.

buv INVENTORS E. KERR & J. SMITH. MOLD FOR HOLLOW ARTICLES. APPLICATION FILED APR.5, 190s.

S o. w M 1 4 T w m A v w 0 m m w 0 M p E l 4 NM m a 6 w 5 6 t P 7 U 7 h/ m 6 Aw /4 a p I 9 \vvvfl /0 5 1 m 8 m, E m m l 9 W E. KERR & J. SMITH.

MOLD FOR HOLLOW ARTICLES. APPLICATION FILED APR. 6, 1909.

9? L ifi Patented Sept. 27, 1910.

'5 SHEETS-SHEET 6.

WITNESSES: m

-w% b% i parts employed tion showing EDA KERR ANDJ'ES SMITH, 01E PE'ETSURG, PEHNSYLVA NIA.

dpccification of letters Patent.

riches.

atented Sept. 2?, 1910.

original application filed September l, 1908, Serial Ito. 451,230. Divided and this application filed April 5,

' i969. serial No. as'aaea To all whom it may concern:

Be it" known that e, ED ARD KERR Janus SMITH, residing at Pittshurg, in the county of Allegheny and State of Pennsylvania, citizens of the United States, have invented or discovered certain new and useful Improvements in Molds for Hollow Articles, of which improvements the following 15 a specification.

The invention described herein relates'to certain improvements in the formation of molds for hollow annular articles such as twyer boxes, coolers, etc.

The invention is hereinafter more fully described and claimed.

In the accompanying drawings forming a part of this specification Figure 1 is a sectional elevation of a completed mold for twyer box. Fig. 2 is a plan view of matrix closing plate and annular core support. Figs. 3 and 4 are sectional elevations in difierent planes of the parts employed for forming the annular core. Fig. 5 is a plan view of plate employed in forming the annular core and showing the core anchors and thickness rings in place thereon; Fig. 6 is a plan view of the stripper plate for the interior or green sand core; Fig. 7 is a sectional view of the in forming the interior or green sand core. Fig. 8 is a sectional elevathe manner of forming the main mold, Fig. 9 is a sectional elevation of a completed mold showing the cores suspended from the closing plate; Figs. 10 and ll are sectional views of the plates shown in Figs. 1, 6 and 7.

The mold consists as shown in Fig. l of the main mold or aslr 1 in which the entire matrix is formed. the core 2 forming the cavity in the annular hody to he formed. the interior core 3 and the matrix closing and core supporting plate a. The formation of the cores in the order mentioned and the main mold will he separately described.

in forming the annular core a pattern block 5 of the desired shape and size is properly centered on a mold hoard 6 having guide pins 6 (see Fig. 3). ,l. stripping plate 7 having an opening of a diameter a little greater than the largest diameter of the pattern hlocl: is placed on the mold hoard around the attern hloclc heing guided to position hy l u pins it" passing throu and h holes in the l in plate (see Figs. 3, 4c and 5). The shoes 8 carrying the ventilating and anchoring rods 9 are next placed in position in radially arranged seats 10 on the stripping plate, as shown in Figs. 4 and 5. In order to prevent metal from adhering to the unprotected portions of the rods 9, the portions thereof ad-' jacent to the shoes are covered with some resistlng material as asbestos paper. Ring sections 11 are next placed around the pat tern block, the sections being slotted for they reception of the anchor rods and being supported by the shoes 8 as shown inFigs. 3, el

and These sections which are removed as hereinafter described, determine the thickness of the metal at the large or outer end of the twyer box. The core box 12 which may be made in sections as shown, is then placed in position. Material suitable for a baked core is thenpacked in the space between the pattern block and core box by any suitable means as for example a jarring machine, in

- which case a banking frame 13 is placed on the core box and clamped down to the bed 6 of the jarring machine, thereby holding the several parts described in position. hoard 6 may be the bed of a molding machine, or the usual mold board when the parts are formed by hand. After the core has been formed, the banking frame is removed and the core box raised up from the core. The stripping plate is then lifted stripping the completed core from the pattern block and the distance ring sections are drawn out leaving the core supported wholly by the ventilating pipes or bars 9, as shown in l ig. 1. The core supported by the plate '4' is then placed in a suitable oven to dry and harden.

The next step in the preparation of the mold is the formation of the central or green sand core 3. which is supported and ventilated liy a tubular core bar 15; This core bar is secured in a centrally located opening in the plate i as shown in Figs. 1 and T, and a stripping plate i6 is placed on the plate -l around the core liar (see Figs. (3, i'. and ll). The plates -l and it: are provided with holes for the reception of the guide pins 6 on the mold board. or lied 6. The stripping plate 16 is provided with rim or head l7 adapted to extend into a groove the lowerend of the core hm: is and with The . The engagement of the blocks 19 with the] blocks Il.) eorrespomling to the shoes 8 and adapted to lit into seats 20 in the plate 4.

seats 20 insures the proper centering of the core box on the plate 4. The lower endor point a of the core is formed in a circular recess 21 in the plate 4 as clearly shown in Fig. l0 and'forms a portion of the mold wall as shown in Figs. 1 and 9. After the sand has been properly tamped in the core box (if desired such tamping can be done in a jarring machine as indicated in Fig. 7) the plate 16 is lifted, stripping the core box from the core 3, and the plate 4 with the core in position thereon is placed on the board 22 (Fig. 1) provided with guide pins-23 for properly centering the different parts of the mold, said pins passing through holes 24 in the plate 4.

In forming the main matrix (see Fig. 8) the core box 18 may be used as pattern, or a separate pattern may be used. When the core box is used for a pattern'as shown in Fig. 8, its upper end is closed by a disk 25, which is provided with a threaded stem 26 extending down through a pattern plate 27. The pattern is properly centered on the plateby a rib 28 projecting into a groove in the end of the core box or pattern, and the latter is clamped in position by a nut 29 screwing on the stem 26. It will be observed that the pattern is supported on a raised portion of the plate 27 and that a stripping plate 30 is passed over this raised portion and rests. on the pattern plate.

ping plate 30 being guide to position by pins 6*, the pattern and stripping plates and the flask being provided with holes for the reception of the pins. The sand can be packed in the flask around the pattern in any suitable manner, as for example by a jarring machine in which case the several parts mentioned are clamped to the bed of the machine by a banking frame 13, as heretofore described. After the completion of the mold, the banking frame is removed, and the mold is stripped from the pattern by lifting the plate 30.

Before placing the mold 1 (contained in flask 31) on the plate 4;, the core 2 is placed in position around the green sand core 3. the position of the core 2 being determined by the seats 20 into which the shoes 8 on the rods 9 enter. After the core 2 has been placed in position, the portion 1 of the mold is lowered down over the cores, being guided to proper position on the plate 4 by pins passing through holes in lugs 33 on th trix, a plate closing a portion of the matrix,

It will be observed that. the matrix for the formation of the article is wholly within a single flask, and that the matrix'is formed with one end closed while the opposite end of the matrix is closed by the plate 4. which having the core also supports the several cores. When the cores and mold are being placed together as shown in Fig. 1. the guide pins 23 should extend. up somewhat above the cores, as the operator cannot otherwise readily observe the relative positions of the parts, when lowering the mold o5 rthe cores. The number and arrangement of these guide pins will be varied to suit requirements, the larger the mold the more pins will be employed.

As shown in Fig. 9 the mold 1 can be placed open end up on the casting floor and the core 2 placed in position, its shoes 8 resting on the end of the flask. The plate 4 3 firmly secured theretois then turned over so that the core will be suspended from the plate, and lowered onto the flask, the core 3 being centered by the pins 34 on the flask entering holes 24 on the plate and also by the shoes 8 entering the seats 20.

It is characteristic of our invention that the several parts of the completed mold, 2'. e. the annular core, the central core and the main matrix or mold are separately formed on independent. plates each of which isprovided with correspomling guide elements and with means to insure that the mold element formed on eaclrplate shall have a pre determined position relative to the guide element of such plate. It. will be observed that the central ('Ol'O is formed on the plate 4- whieh in the completed mold forms the 0 drag as in Fig. l or the cope as in Fig. 9 A suitable flask 31 is (placed on the striponeend of said (:oi'e fitting in a recess in said plate which is also provided with seats for properly locating the annular corewith reference to the central core and that suitable guiding means are employed on the plate and flask to insure the proper adjustment of the main matrix relative to the annular core. By supporting the cores on a rigid metal plate having means insuring the proper relative positions of the cores and the main matrix relative to the cores, the formation of defective castings due to the shifting of one of the shaping elements is reduced to a minimum.

No claim is made herein to the means emploved outside of the mold proper for forming the mold, although such means are described and shown with considerable particularity, as the same forms the subjectmatter of an application filed September 3st, 1908, Serial No. 451,230, of which this pplication is a division.

We claim herein as our invention:

1. .l. mold having in combination a maand cores independently supported by the plate and extending intothe matrix, through the opening closed by the plate.

2. A mold for hollow articles having in combinationaflask having formed therein a matrix, a plate for closing a ortion of the ma- In testimony whereof, We have hereunto trix and provided with in ependent seats en set-our hands. I recesses for the cores, and cores provided EDWARD KERR. with prints or anchors fitting in the seats (1' JAMES SMITH;

5 recesses of the plat-e and extending into the Witnesses:

matrix through the opening closed by the Amen-A. TRILL,

plate; FRANCIS J. TOMASSON. 

